Molecular Beam Studies of Collisions and Reactions at the Gas-Liquid Interface

在化学系物理化学计划的这个项目中，麦迪逊威斯康星大学化学系的Gilbert Nathanson教授将继续他对气体和液体之间相互作用的研究，这些研究从排斥碰撞到陷阱和溶剂化。将进行三组实验：1.烃类气体轰击石蜡、烯烃和芳烃液体，以了解液态分子的结构和键的变化如何支配表面波纹和气液能量传递；2.惰性气体原子轰击液态金属铟、镓和In/Ga共晶合金的表面，以考察表面和亚表面原子在吸收撞击能量中所起的作用；3.气态水、氨、短链醇和氯化氢将轰击硫酸表面，以绘制出硫酸的散射和溶剂化作用随撞击角和碰撞能的函数。质谱学和飞行时间速度分析将被用来监测分散产品的身份、平移能量和方向。在分子长度尺度上探测液体界面的实验工作很少。这项研究很有可能揭示新的现象，发现气体-表面相互作用机制的新方面。这项研究中使用的技术是由首席调查员开发的。这项研究的结果将对物理化学的其他领域产生影响，如成核、蒸发、表面化学反应、聚合物物理和涉及气溶胶粒子的大气化学。

In this project in the Physical Chemistry program of the Chemistry Division, Prof. Gilbert Nathanson of the Chemistry Department of the University of Wisconsin in Madison will continue his researches on the interactions between gases and liquids, these ranging from repulsive collisions to trapping and solvation. Three sets of experiments will be conducted: 1. paraffin, olefin, and aromatic liquids will be bombarded by hydrocarbon gases in order to learn how changes in the structure and bonding of liquid phase molecules govern surface corrugation and gas-liquid energy transfer; 2. inert gas atoms will bombard the surfaces of liquid metals indium and gallium and the In/Ga eutectic alloy to examine the roles played by surface and sub-surface atoms in absorbing the impact energy; 3. gaseous water, ammonia, short chain alcohols, and hydrogen chloride will bombard a sulfuric acid surface to map out the scattering from, and solvation in, sulfuric acid as function of impact angle and collision energy. Mass spectroscopy and time-of-flight velocity analysis will be used to monitor the identity, translational energy, and direction of scattered products. There is little experimental work being done probing the liquid interfaces at the molecular length scales. This research has a high probability of exposing new phenomena and discovering new aspects of gas-surface interaction mechanisms. The techniques employed in this research were developed by the principal investigator. The results of this research will have bearing on other areas of physical chemistry such as nucleation, vaporization, chemical reactions at surfaces, polymer physics, and atmospheric chemistry involving aerosol particles.